Siemens 7SR51 - Logic of the Function; Application and Setting Notes

Logic of the Function
[lo_7SR5_37logicdiagram, 1, en_US]
Figure 5-6
Logic Diagram: 37 Undercurrent Protection – Phase
Application and Setting Notes
Parameter: 37 Common > UC Guard Setting
•
Default setting: 0.1 x I
n
(0.1 ⋅ I
rated
)
Current elements can be blocked if all phase currents fall below setting.
Parameter: Element
•
Default setting: Disabled
This setting is used to allow the element to be switched on and off if it is not required. A separate setting
is provided for each element. This setting can be used to select the number of elements required.
5.5.3
5.5.4
Protection and Automation Functions
5.5 37 Undercurrent Protection – Phase
174 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019